Control system for generator mounted on vehicle

• US 5,256,959 A
• Filed: 03/15/1991
• Issued: 10/26/1993
• Est. Priority Date: 03/19/1990
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Mori, Yuichi, Nagano, Masami, Sakamoto, Masahide, Atago, Takeshi
• Primary Examiner(s): KINCAID, KRISTINE LYNN
• Application Number:
  US07/670,285
• Time in Patent Office: 956 Days
• Field of Search: 322/22, 322/23, 322/24, 322/25, 322/28, 322/29, 322/33, 322/34, 320/64, 320/68, 320/61, 320/62
• US Class Current: 322/25
• CPC Class Codes: H02J 7/1446 in response to parameters of a vehicle
• CPC Class Codes: H02P 9/14 by variation of field H02P9/08, H02P9/10 take precedence
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A control system for controlling the full current of a generator for a vehicle having an internal combustion engine operates to control the field current so as to change the output power of the generator. A storage unit is charged by the generator; a field current control unit for controlling the field current of the generator detects the output generated by the storage unit; and an engine control unit to which operation parameters of the internal combustion engine are applied controls at least one of a fuel supply and an ignition timing for the internal combustion engine. The engine control unit further operates to determine a kind of change of load being applied to the internal combustion engine when the load has changed and to control the field current of the generator in accordance with a predetermined control pattern corresponding to the kind of change of the load.

Claims

1. A control system for controlling the field current of a generator, driven by an internal combustion engine, so as to vary the output power of said generator, comprising:

storage means charged by said power generated by said generator;

field current control means for controlling the field current of said generator in response to an output voltage of said storage means; and

engine control means responsive to operation parameters of said internal combustion engine for controlling at least one of a fuel supply and an ignition timing for said internal combustion engine, including means for determining a kind of change of a load applied to said internal combustion engine when said load has changed and for controlling the field current of said generator in accordance with a predetermined control pattern corresponding to said kind of change of the load.

14. A control system for a generator according to claim 1, wherein said predetermined control pattern comprises an initial cut section for defining an initial power generation cut value and a reduction section for gradually returning said power generation from said initial power generation cut value to an original power generation value.

2. A control system for controlling the field current of a generator, driven by an internal combustion engine, so as to vary the output power of said generator, comprising:

storage means charged by said power generated by said generator;

field current control means for controlling the field current of said generator in response to an output voltage of said storage means; and

engine control means responsive to operation parameters of said internal combustion engine for controlling at least one of a fuel supply and an ignition timing for said internal combustion engine, including means for determining a kind of change of a load applied to said internal combustion engine when said load has changed and for controlling the field current of said generator in accordance with a predetermined control pattern corresponding to said kind of change of the load;

wherein said predetermined control pattern comprises an initial cut section for defining an initial power generation cut value, a delay section for maintaining said power generation at said initial power generation cut value and a reduction section for gradually returning said power generation from said initial power generation cut value to an original power generation value.

3. A control system for a generator according to claim 2, wherein said engine control means sets the duration of said delay section of said predetermined control pattern corresponding to a temperature of said internal combustion engine when it is decided that said internal combustion engine is in an igniting state.

4. A control system for a generator according to claim 2, wherein when it is decided that said internal combustion engine is in an acceleration sate, said engine control means detects the level of the acceleration and sets the duration of said delay section of said predetermined control pattern according to said acceleration level.

5. A control system for a generator according to claim 2, wherein when it is decided that the vehicle having said internal combustion engine is in a state of starting, said engine control means sets the duration of said delay section of said predetermined control pattern according to a temperature of said internal combustion engine.

6. A control system for a generator according to claim 2, wherein when it is decided that said internal combustion engine is in an idle state, said engine control means sets the duration of said delay section of said predetermined control pattern to zero.

7. A control system for a generator according to claim 3, wherein said engine control means further sets said initial power generation cut value of said predetermined control pattern to 100% in terms of a duty ratio defined by the off time ratio of a power transistor for controlling the generator.

8. A control system for a generator according to claim 4, wherein said engine control means further sets said initial power generation cut value of said predetermined control pattern according to a number of revolutions of said internal combustion engine.

9. A control system for a generator according to claim 5, wherein said engine control means further sets said initial power generation cut value of said predetermined control pattern according to a number of revolutions of said internal combustion engine.

10. A control system for a generator according to claim 6, wherein when an electrical load of said generator has increased, said engine control means further sets said initial power generation cut value of said predetermined control pattern according to an output current from said generator before said increase of the electrical load and the output voltage of said storage means.

11. A control system for a generator according to claim 6, wherein when a mechanical load to said internal combustion engine has increased, said engine control means further sets said initial power generation cut value of said predetermined control pattern according to a number of revolutions of said internal combustion engine and the output voltage of said storage means.

12. A control system for a generator according to claim 4, wherein said engine control means further sets the slope of said reduction section of said predetermined control pattern according to said level of acceleration.

13. A control system for a generator according to claim 5, wherein said engine control means further sets the slope of said reduction section of said predetermined control pattern according to said temperature of said internal combustion engine.